ECDSA 无法加密消息，只能做签名。
ECDSA can't encrypt messages, only sign signatures.
永久记录明文消息给所有人看是不明智的。这样做迟早会出问题。
It would be unwise to have permanently recorded plaintext messages for everyone to see. It would be an accident waiting to happen.
如果要有一个消息系统，它应该是与 bitcoin 网络并行的独立系统。消息不应记录在区块链里。消息能用 bitcoin 地址的密钥对签名，以证明来源。
If there's going to be a message system, it should be a separate system parallel to the bitcoin network. Messages should not be recorded in the block chain. The messages could be signed with the bitcoin address keypairs to prove who they're from.
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Suggestion: Allow short messages to be sent together with bitcoins ?
